The combustion gas radiance of solid rocket propellants was measured by remote Fourier Transform Infrared spectroscopy. The IR radiance spectra of combustion gases of two propellants in the wavenumber range of 500 to 4 500 cm^-1 at a resolution of 1 cm^-1 were recorded. The curves of change in the integrated radiance (emission energies) of combustion gases of two propellants with the burning time were obtained by the method of integrating the radiance between 2 000 to 3 333 cm^-1. Information was obtained on the components of combustion gas and characteristics of combustion processes of two propellants.